Patent GB-443919-A (GB)
Title: Improvements in or relating to mechanism for providing register in driving mechanism
IPC: B41F13/00
Filed: 1934-09-10
Abstract: 443,919. Operating clutches. MOORE, P. J., 17, Sumner Street, Southwark Bridge Road, London. Sept. 10, 1934, No. 26013. [Class 80 (ii)] [See also Group XXXVII] In a claw clutch, engageable only in one relative position of the clutch parts 2 and 4, means are provided whereby drive can be transmitted to the driving shaft 1 when the clutch is disengaged, but the drive is interrupted upon engagement being attempted, when the clutch parts reach a predetermined relative position such that the shaft 1 comes to rest, with or without the application of a brake, with the clutch parts in register. The clutch engaging movement can now be completed, whereupon drive can again be transmitted to the shaft 1. The invention is applicable to an intaglio printing machine wherein the printing cylinders are driven from the shaft 1 while a folding mechanism is driven from a hollow shaft 5 adapted to be connected to the shaft 1 through the clutch. The shaft 1 is connected to an electric motor which, if a " stop " circuit is opened, is de-energized until a separate " start " circuit is closed. As shown in Fig. 1, the clutch part 2, splined on the shaft 1, is actuated by a fork 18 having a lost-motion connection 42, 43 with a control lever 19, which latter is also connected to a pair of switches 20<2>, 20<3>. A cam block 16 on the member 2 cooperates with a roller 14 on a spring-pressed lover 11 carried by the shaft 5 to control a semi-rotary switch 7 also carried by the shaft 5, this switch having segments 27, 28, 29 connected to slip rings 24, 25, 26 engaged by fixed brushes 23, 31, 37. The brushes 23 and 31 are connected to the two sides 21 and 32<1> of the " stop " circuit, the two contacts 34 and 35 of the switch 20<2> are connected to the two sides 32<1> and 21, while the two contacts 39 and 40 of the switch 20<3> are connected to the brush 37 and the side 32<1>. With the clutch disengaged, switch 20<2> is closed, whereby the circuit is closed, allowing the motor to be energized. Upon attempting engagement, switch 20<2> is first opened, switch 20<3> remaining open. Unless roller 14 is in engagement with block 16, the movable member 30 of switch 7 is connecting the segments 27, 28, so that the circuit is still closed. When the block engages the roller 14, however, member 30 is moved to break the circuit, causing shaft 1 to come to rest. The length of the block and its position on the member 2 are adjustable, the adjustments being so made that shaft 1 comes to rest with the clutch parts in register and with the roller 14 still in engagement with the block 16. The engaging movement of the lever 19 may now be completed. During this movement, switch 20<3> is closed, and, since member 30 now connects segments 27 and 29, the circuit is again closed, allowing the motor to be energized. The parts 4 and 5 may be connected by shear pins. In the form shown in Fig. 6, insulated sleeves 52, 57 carried bv the parts 2, 4 are engaged by stationary brushes 54, 59 connected to the two sides 56, 61 of the " stop " circuit. Sleeve 52 has a finger 51, and sleeve 57, which is angularly adjustable on the part 4, has a block 62 of insulating material recessed in its surface. The control lever 19 is connected to the clutch yoke 18 and has a lostmotion connection with a pair of switches 64<1>, 64<2> arranged in parallel between the sides 56, 61. With the clutch disengaged, switch 64<1> is closed. On attempting engagement, finger 51 first engages sleeve 57 and then switch 64<1> is opened, so that the circuit remains closed until the finger 51 engages the block 62, when the circuit is broken. With the clutch engaged, switch 64<2> is closed. According to the Provisional Specification, the block 16 may be replaced by a recess in the member 2, and the end face of the member 2 may be provided with balls or rollers adapted to contact with the member 4 when engagement is being attempted, or there may be a dashpot device between the control lover and the part 2 so as to delay the engaging movement of the latter.